1 /* 2 * Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_GC_G1_G1_GLOBALS_HPP 26 #define SHARE_VM_GC_G1_G1_GLOBALS_HPP 27 28 #include "runtime/globals.hpp" 29 // 30 // Defines all globals flags used by the garbage-first compiler. 31 // 32 33 #define G1_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw) \ 34 \ 35 product(uintx, G1ConfidencePercent, 50, \ 36 "Confidence level for MMU/pause predictions") \ 37 \ 38 develop(intx, G1MarkingOverheadPercent, 0, \ 39 "Overhead of concurrent marking") \ 40 \ 41 develop(intx, G1MarkingVerboseLevel, 0, \ 42 "Level (0-4) of verboseness of the marking code") \ 43 \ 44 develop(bool, G1TraceMarkStackOverflow, false, \ 45 "If true, extra debugging code for CM restart for ovflw.") \ 46 \ 47 develop(bool, G1TraceHeapRegionRememberedSet, false, \ 48 "Enables heap region remembered set debug logs") \ 49 \ 50 diagnostic(bool, G1SummarizeConcMark, false, \ 51 "Summarize concurrent mark info") \ 52 \ 53 diagnostic(bool, G1SummarizeRSetStats, false, \ 54 "Summarize remembered set processing info") \ 55 \ 56 diagnostic(intx, G1SummarizeRSetStatsPeriod, 0, \ 57 "The period (in number of GCs) at which we will generate " \ 58 "update buffer processing info " \ 59 "(0 means do not periodically generate this info); " \ 60 "it also requires -XX:+G1SummarizeRSetStats") \ 61 \ 62 diagnostic(bool, G1TraceConcRefinement, false, \ 63 "Trace G1 concurrent refinement") \ 64 \ 65 experimental(bool, G1TraceStringSymbolTableScrubbing, false, \ 66 "Trace information string and symbol table scrubbing.") \ 67 \ 68 product(double, G1ConcMarkStepDurationMillis, 10.0, \ 69 "Target duration of individual concurrent marking steps " \ 70 "in milliseconds.") \ 71 \ 72 product(intx, G1RefProcDrainInterval, 10, \ 73 "The number of discovered reference objects to process before " \ 74 "draining concurrent marking work queues.") \ 75 \ 76 experimental(bool, G1UseConcMarkReferenceProcessing, true, \ 77 "If true, enable reference discovery during concurrent " \ 78 "marking and reference processing at the end of remark.") \ 79 \ 80 product(size_t, G1SATBBufferSize, 1*K, \ 81 "Number of entries in an SATB log buffer.") \ 82 \ 83 develop(intx, G1SATBProcessCompletedThreshold, 20, \ 84 "Number of completed buffers that triggers log processing.") \ 85 \ 86 product(uintx, G1SATBBufferEnqueueingThresholdPercent, 60, \ 87 "Before enqueueing them, each mutator thread tries to do some " \ 88 "filtering on the SATB buffers it generates. If post-filtering " \ 89 "the percentage of retained entries is over this threshold " \ 90 "the buffer will be enqueued for processing. A value of 0 " \ 91 "specifies that mutator threads should not do such filtering.") \ 92 \ 93 experimental(intx, G1ExpandByPercentOfAvailable, 20, \ 94 "When expanding, % of uncommitted space to claim.") \ 95 \ 96 develop(bool, G1RSBarrierRegionFilter, true, \ 97 "If true, generate region filtering code in RS barrier") \ 98 \ 99 diagnostic(bool, G1PrintRegionLivenessInfo, false, \ 100 "Prints the liveness information for all regions in the heap " \ 101 "at the end of a marking cycle.") \ 102 \ 103 product(size_t, G1UpdateBufferSize, 256, \ 104 "Size of an update buffer") \ 105 \ 106 product(intx, G1ConcRefinementYellowZone, 0, \ 107 "Number of enqueued update buffers that will " \ 108 "trigger concurrent processing. Will be selected ergonomically " \ 109 "by default.") \ 110 \ 111 product(intx, G1ConcRefinementRedZone, 0, \ 112 "Maximum number of enqueued update buffers before mutator " \ 113 "threads start processing new ones instead of enqueueing them. " \ 114 "Will be selected ergonomically by default. Zero will disable " \ 115 "concurrent processing.") \ 116 \ 117 product(intx, G1ConcRefinementGreenZone, 0, \ 118 "The number of update buffers that are left in the queue by the " \ 119 "concurrent processing threads. Will be selected ergonomically " \ 120 "by default.") \ 121 \ 122 product(intx, G1ConcRefinementServiceIntervalMillis, 300, \ 123 "The last concurrent refinement thread wakes up every " \ 124 "specified number of milliseconds to do miscellaneous work.") \ 125 \ 126 product(intx, G1ConcRefinementThresholdStep, 0, \ 127 "Each time the rset update queue increases by this amount " \ 128 "activate the next refinement thread if available. " \ 129 "Will be selected ergonomically by default.") \ 130 \ 131 product(intx, G1RSetUpdatingPauseTimePercent, 10, \ 132 "A target percentage of time that is allowed to be spend on " \ 133 "process RS update buffers during the collection pause.") \ 134 \ 135 product(bool, G1UseAdaptiveConcRefinement, true, \ 136 "Select green, yellow and red zones adaptively to meet the " \ 137 "the pause requirements.") \ 138 \ 139 product(size_t, G1ConcRSLogCacheSize, 10, \ 140 "Log base 2 of the length of conc RS hot-card cache.") \ 141 \ 142 product(uintx, G1ConcRSHotCardLimit, 4, \ 143 "The threshold that defines (>=) a hot card.") \ 144 \ 145 develop(intx, G1RSetRegionEntriesBase, 256, \ 146 "Max number of regions in a fine-grain table per MB.") \ 147 \ 148 product(intx, G1RSetRegionEntries, 0, \ 149 "Max number of regions for which we keep bitmaps." \ 150 "Will be set ergonomically by default") \ 151 \ 152 develop(intx, G1RSetSparseRegionEntriesBase, 4, \ 153 "Max number of entries per region in a sparse table " \ 154 "per MB.") \ 155 \ 156 product(intx, G1RSetSparseRegionEntries, 0, \ 157 "Max number of entries per region in a sparse table." \ 158 "Will be set ergonomically by default.") \ 159 \ 160 develop(bool, G1RecordHRRSOops, false, \ 161 "When true, record recent calls to rem set operations.") \ 162 \ 163 develop(bool, G1RecordHRRSEvents, false, \ 164 "When true, record recent calls to rem set operations.") \ 165 \ 166 develop(intx, G1MaxVerifyFailures, -1, \ 167 "The maximum number of verification failures to print. " \ 168 "-1 means print all.") \ 169 \ 170 develop(bool, G1ScrubRemSets, true, \ 171 "When true, do RS scrubbing after cleanup.") \ 172 \ 173 develop(bool, G1RSScrubVerbose, false, \ 174 "When true, do RS scrubbing with verbose output.") \ 175 \ 176 develop(bool, G1YoungSurvRateVerbose, false, \ 177 "print out the survival rate of young regions according to age.") \ 178 \ 179 develop(intx, G1YoungSurvRateNumRegionsSummary, 0, \ 180 "the number of regions for which we'll print a surv rate " \ 181 "summary.") \ 182 \ 183 product(uintx, G1ReservePercent, 10, \ 184 "It determines the minimum reserve we should have in the heap " \ 185 "to minimize the probability of promotion failure.") \ 186 \ 187 diagnostic(bool, G1PrintHeapRegions, false, \ 188 "If set G1 will print information on which regions are being " \ 189 "allocated and which are reclaimed.") \ 190 \ 191 develop(bool, G1HRRSUseSparseTable, true, \ 192 "When true, use sparse table to save space.") \ 193 \ 194 develop(bool, G1HRRSFlushLogBuffersOnVerify, false, \ 195 "Forces flushing of log buffers before verification.") \ 196 \ 197 develop(bool, G1FailOnFPError, false, \ 198 "When set, G1 will fail when it encounters an FP 'error', " \ 199 "so as to allow debugging") \ 200 \ 201 product(size_t, G1HeapRegionSize, 0, \ 202 "Size of the G1 regions.") \ 203 \ 204 product(uintx, G1ConcRefinementThreads, 0, \ 205 "If non-0 is the number of parallel rem set update threads, " \ 206 "otherwise the value is determined ergonomically.") \ 207 \ 208 develop(bool, G1VerifyCTCleanup, false, \ 209 "Verify card table cleanup.") \ 210 \ 211 product(size_t, G1RSetScanBlockSize, 64, \ 212 "Size of a work unit of cards claimed by a worker thread" \ 213 "during RSet scanning.") \ 214 \ 215 develop(uintx, G1SecondaryFreeListAppendLength, 5, \ 216 "The number of regions we will add to the secondary free list " \ 217 "at every append operation") \ 218 \ 219 develop(bool, G1ConcRegionFreeingVerbose, false, \ 220 "Enables verboseness during concurrent region freeing") \ 221 \ 222 develop(bool, G1StressConcRegionFreeing, false, \ 223 "It stresses the concurrent region freeing operation") \ 224 \ 225 develop(uintx, G1StressConcRegionFreeingDelayMillis, 0, \ 226 "Artificial delay during concurrent region freeing") \ 227 \ 228 develop(uintx, G1DummyRegionsPerGC, 0, \ 229 "The number of dummy regions G1 will allocate at the end of " \ 230 "each evacuation pause in order to artificially fill up the " \ 231 "heap and stress the marking implementation.") \ 232 \ 233 develop(bool, G1ExitOnExpansionFailure, false, \ 234 "Raise a fatal VM exit out of memory failure in the event " \ 235 " that heap expansion fails due to running out of swap.") \ 236 \ 237 develop(uintx, G1ConcMarkForceOverflow, 0, \ 238 "The number of times we'll force an overflow during " \ 239 "concurrent marking") \ 240 \ 241 experimental(uintx, G1NewSizePercent, 5, \ 242 "Percentage (0-100) of the heap size to use as default " \ 243 "minimum young gen size.") \ 244 \ 245 experimental(uintx, G1MaxNewSizePercent, 60, \ 246 "Percentage (0-100) of the heap size to use as default " \ 247 " maximum young gen size.") \ 248 \ 249 experimental(uintx, G1MixedGCLiveThresholdPercent, 85, \ 250 "Threshold for regions to be considered for inclusion in the " \ 251 "collection set of mixed GCs. " \ 252 "Regions with live bytes exceeding this will not be collected.") \ 253 \ 254 product(uintx, G1HeapWastePercent, 5, \ 255 "Amount of space, expressed as a percentage of the heap size, " \ 256 "that G1 is willing not to collect to avoid expensive GCs.") \ 257 \ 258 product(uintx, G1MixedGCCountTarget, 8, \ 259 "The target number of mixed GCs after a marking cycle.") \ 260 \ 261 experimental(bool, G1EagerReclaimHumongousObjects, true, \ 262 "Try to reclaim dead large objects at every young GC.") \ 263 \ 264 experimental(bool, G1EagerReclaimHumongousObjectsWithStaleRefs, true, \ 265 "Try to reclaim dead large objects that have a few stale " \ 266 "references at every young GC.") \ 267 \ 268 experimental(bool, G1TraceEagerReclaimHumongousObjects, false, \ 269 "Print some information about large object liveness " \ 270 "at every young GC.") \ 271 \ 272 experimental(uintx, G1OldCSetRegionThresholdPercent, 10, \ 273 "An upper bound for the number of old CSet regions expressed " \ 274 "as a percentage of the heap size.") \ 275 \ 276 experimental(ccstr, G1LogLevel, NULL, \ 277 "Log level for G1 logging: fine, finer, finest") \ 278 \ 279 notproduct(bool, G1EvacuationFailureALot, false, \ 280 "Force use of evacuation failure handling during certain " \ 281 "evacuation pauses") \ 282 \ 283 develop(uintx, G1EvacuationFailureALotCount, 1000, \ 284 "Number of successful evacuations between evacuation failures " \ 285 "occurring at object copying") \ 286 \ 287 develop(uintx, G1EvacuationFailureALotInterval, 5, \ 288 "Total collections between forced triggering of evacuation " \ 289 "failures") \ 290 \ 291 develop(bool, G1EvacuationFailureALotDuringConcMark, true, \ 292 "Force use of evacuation failure handling during evacuation " \ 293 "pauses when marking is in progress") \ 294 \ 295 develop(bool, G1EvacuationFailureALotDuringInitialMark, true, \ 296 "Force use of evacuation failure handling during initial mark " \ 297 "evacuation pauses") \ 298 \ 299 develop(bool, G1EvacuationFailureALotDuringYoungGC, true, \ 300 "Force use of evacuation failure handling during young " \ 301 "evacuation pauses") \ 302 \ 303 develop(bool, G1EvacuationFailureALotDuringMixedGC, true, \ 304 "Force use of evacuation failure handling during mixed " \ 305 "evacuation pauses") \ 306 \ 307 diagnostic(bool, G1VerifyRSetsDuringFullGC, false, \ 308 "If true, perform verification of each heap region's " \ 309 "remembered set when verifying the heap during a full GC.") \ 310 \ 311 diagnostic(bool, G1VerifyHeapRegionCodeRoots, false, \ 312 "Verify the code root lists attached to each heap region.") \ 313 \ 314 develop(bool, G1VerifyBitmaps, false, \ 315 "Verifies the consistency of the marking bitmaps") 316 317 G1_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG, DECLARE_MANAGEABLE_FLAG, DECLARE_PRODUCT_RW_FLAG) 318 319 #endif // SHARE_VM_GC_G1_G1_GLOBALS_HPP